Malicious PDF — malware analysis report

Static analysis result for SHA-256 6885511653b1b957…

MALICIOUS

PDF

85.0 KB Created: 2021-03-05 21:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c103b082c7346a64b6333eaaa22e8acb SHA-1: 73d04b039e92c46e38b62208e9d498ffde41d296 SHA-256: 6885511653b1b957c0428f6f91b8cd11f46743033ef106742c8f6d3e8806b2da
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://mezovuduw.ru/strik?utm_term=tower+of+the+mad+mage+stat+caps, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/strik?utm_term=tower+of+the+mad+mage+stat+caps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478946/normal_60209b48cdea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_60002ae85d1b0.pdfIn PDF document text
    • http://helpcopyright-service.com/getazunegasitizituliraadie0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_602654273e67e.pdfIn PDF document text
    • http://astropsychology.site/sogibal5u09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5fff62af81e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_600a1f801344a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_5ff7828d9bb63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476133/normal_5ff3f4b86012b.pdfIn PDF document text
    • http://haifaiv.ru/class_4_maths_olympiad_sample_papersc546t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_6040af39f3111.pdfIn PDF document text
    • http://bluebadgeapproval.com/9663926069stbvw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_60210aa4bbf36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_d8334cd64d954d5eb5b6df1e577fe175.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_fa56452c55584b4cb0935e4352506477.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_3c887765f60e47d1ac4472b7c9253592.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb37088-6090-438b-9ab2-58b26045d1b9/janitrol_heater_installation_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bace892-a3c6-469a-a2dc-c7c735932290/how_to_check_solenoid_on_ezgo_golf_cart.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_b66d143727644277a7797a54b00592c3.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_bdc8d9a18948423d97312f668aee4bda.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_9d79cb9d6d0e44c7a9cfaa7a8f32c6eb.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_d7cfb28656524962b1bb8e3a7cf64c35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/701f33de-ca56-409f-b862-3e312ec5855a/73942715168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d06c60-7bd4-447c-aa1e-24f962efaa46/first_phase_of_philippine_revolution_summary.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 5576 bytes
SHA-256: d2b9ca55ec2ac8f4a36058b107cb9e67a88e42b04f431f13f6e8461e40acb92c
font_01_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 10780 bytes
SHA-256: 5c875255b658eb0c3a06a8f51d5b3f1aa3906c05a6abbb55eba2af54794acf33